Look, you don't even need an "idea" for your startup, much less one based on some ethereal "trend" you should try to catch.
What you need is a goal and a vision for an improvement to something that people want. Take any current service, and try to figure out what metric people are really using to evaluate it.
Now think about what it would take to 10x that metric. I'm stressing the really because that's where you have to do some folk anthropology and try to understand what people really want.
If you think people eat food to maximize calories, providing them with 10x calories would sound like a good thing, but that's probably not what's happening. Maybe what you want to figure out is how to have 10x calories / dollar.
But people don't just eat food for calories, they also eat it for the nutrient mix. What would be the perfect nutrient mix? Does it need to be custom? Can it be done at a good cost? (that's kind of what Soylent has been doing)
Food is also one way we experience some of the most varied sensations: can you make something that's both incredibly nutritious, and that expands people's palates?
Food is also built around social experiences, how can you improve the social experience of cooking and eating together? What's the metric? What does 10x that metric look like?
Can you 10x along those 3 axes at the same time? Are there trade offs? Can you overcome them?
I'm just using food as it's an obvious need/want everyone recognizes (low on the Maslow pyramid).
But that can apply to literally anything, as long as you dig deep enough to figure out the underlying need/desire/want.
And that way you can quit trying to find random "ideas" based on trends that are just at the surface of things.
Jeff Bezos (and a bunch of other people) said it before: don't try to think of what's going to change, think about what's not going to change. People's desires are one of the most stable thing you can build on. Figure out that bit and you'll find a bottomless well of ideas.